The Twenty-Five Most Valuable Blogs

"There is no way to accurately put a value on blogs and blogging companies. All are privately-held and, as is true with many content businesses, the value of the company is based on what a buyer will pay. The figures we have put together look at advertising revenue and income from related businesses like conferences. We have not included blogs affiliated with larger media companies."

XPLANE's xBlog has been up and running since 1999. 

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